steve hair tan live for news cairo. steve? >> shepard, this is really a new tactic for the opposition protesters. instead of simply staying here in tahrir square and chanting they went on offensive tonight toward the presidential palace. they got right to the compound walls until being tear gassed. it was reenergized the opposition. we have seen increase in recent days now they are out in full force. one factor to keep in mind about the demonstrations today, there were no serious injuries reported. despite the scenes of chaos, both sides evidently still using some restraint. next on the agenda of vote december 15th on a constitution heavily criticized as a rush job that favors islamist parties. it's clear the muslim brotherhood will try and get out a strong yes vote on that constitution. what's not clear is the opposition's tactics. will they try to get out a no vote or will they abstain considering the whole process unjust? shepard, back to you? >> steve harrigan live tonight in cairo. the former new york city mayor ed koch i